i have a question abouy the timing chain on my ds. i have the motor out and the top cover off. the chain between the sprockets at the top is loose but its tight everywhere else. is this normal or do i need a chain and gears?? thanks

 

First off what are you trying to do? Are the cam marks lined up? How loose is it ie amount of play in chain ? Are you doing cam work? There shouldnt be much play between the cam gears. Is the chain guide on the top between the gears in good shape?